Loop-taker for sewing machines



Sept. 28, 1933.

A. GRIEB LOOP TAKER FOR SEWING MACHINES Filed April 6, 1932 wi/i weaw Patented Sept. 26, 1933 LOOP-TAKER non snwnvc MACHINES J Alfred Grieb, Elizabeth, N. J., assignor to The Singer Manufacturing Company, Elizabeth,

N. J., a corporation of New Jersey I Application April 6, 1932. Serial No. 603,509

' 12 Claims; (01. 112--228) This invention relates to sewing machine looptakers and more particularly to that type of loop-taker known as the revolving hook.

One of the objects of this invention is to 5 provide an improved yielding raceway for the bobbin-carrier bearing flange.

Another object of this invention is to provide improved means for preventing lateral shifting movement between the loop-taker body and cover-ring or gib. a 2

'Another object of this invention is to provide improved means permittingready removal of the bobbin-carrier from the loop-taker body, thereby providing access to the raceway and bobbin-carrier bearing flange for inspection and cleaning. v

Another object of this invention isto provide the loop-taker with improved means for clearing the raceway. V

With the above and other objects in view, as will hereinafter appear, the invention consists in the devices, combinationsand arrangements of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art. I 0 0 2 In the accompanying drawing: 0 Figure 1 is a topplan view of my improved loop-taker showing the thread-carrier and coverringin their operative positions;

Figure 2 is a bottom plan view of the loop taker.

Figure 3 is an elevationof the side of the loop taker opposite the loop-seizing beak.

' Figure 4 is a side elevation of the loop-taker looking from the right toward Figure 3. Figure 5'is a sectional view taken along the line 5--5 of Figure 1. I Figure 6 is a bottom perspective view of the cover-ringer gib." I I Figure "I is a disassembled perspective view of the complete loop-taker.

Figure 8 is a fragmentary perspective view "showing the method of removing the'cover-ring from the hook-body. I

' lnthe embodiment of this invention selected for illustration, the loop-taker comprises a cupshaped hook body l having the usual loop-seizing beak 2 formed in its wan. The base of the hook-body 1 is centrally apertured are to admit the well known vertical axis loop-taker driving shaft upon which it is'adapted to besecured.

. The hook bodyil is provided with the usual open-topped annular raceway l which receives the annular bearing flange 5 of the bobbincarrier 6. Yieldingly secured upon the upper face '7 of the hook-body 1 is a cover-ring or gib 8 having a downturned inner flange 9 with an intermediate step-like shoulder 10, as shown in Figures 5 and 6. The inner flange 9 extends into the channel 11 in the annular bearing flange 5 of the bobbin-carrier 6 and the shoulder 10 extends slightly into the open top of the raceway 4 and below the upper face f the hook-body 1, as shown in Figure 5, when the gib or coverring is in its operative position. The function of the shoulder 10 on the cover-ring 8 is to prevent the cover-ring from sliding laterally over the surface of the upper face 7 of the hook-body.

In the present embodiment the cover-ring 8, instead of being rigidly fixed by screws, is yieldingly held upon the hook-body 1 by two substan-.-

tially diametrically opposed L-shaped spring-clips 7 12 and 13 formed with U-shaped bends 17- and 17" and secured to the base of the hook-body by the screws 12' and 13. The clips 12 and 13 are seated in recesses 14 and 14' in the periphery of the hook-body and. their upper ends are bent laterally to provide lips 15 and 16, respectively, which'overlie the raceway cover-ring 8 and yieldingly hold the cover-ring upon the upper face 7 of the hook-body. It will be observed that the shape oftheflat springs'lZ and 13 permits the lips 15 and 16 to yield outwardly and upwardly with respect to the hook-body.

The cover-ring 8 is formed with a locking notch 18, 'a narrower notch 25 withinthe notch 18, an arcuate shaped notch 19, and av shoulder 20. Between the notches 18 and 19 the thickness of the cover-ring 8 is reduced as shown at 21 and between the shoulder 20 and the end 22 of the cover-ring 8, as at 23, the thickness of the coverring is likewise reduced. To place the cover-ring 8 in its operative position, the cover-ring is placed upon the upper face 7 of the hook-body with the arcuate shaped notch 19 in register with the lip 15 of the flat spring 12 and the end 22 adjacent the lip 16 of the flat spring 13. .The cover-ring is then turned relative to the hookbody in a clockwise direction. Upon the initial.-

movement in this direction, the cam-like shoulder 24 on the cover-ring 8 forces the spring clip ing notch 18. The cover-ring 8 is thus locked in its operative position when the spring-clip 12 enters the shouldered locking notch 18. It will be obvious that the shoulder 10 on the coverring 8 centers the cover-ring upon the hookbody and prevents lateral shifting of the coverring relative to the hook-body. Any tendency of the cover-ring 8 to rotate relative to the hookbody is prevented by the shoulders of the locking notch 18 engaging the sides of the spring-clip 12.

From the foregoing it will be observed that the spring-clips 12 and 13 may yield both upwardly and outwardly with respect to the hookbody 1 and that the clips 12 and 13, through the agency of their lips 15 and 16 which overlie the cover-ring 8, yieldingly urge the cover-ring against the upper face 7 of the hook-body. 1, thus providing a raceway which will yield in the event that any thread is drawn in the raceway.

To remove the cover-ring 8, a screw-driver or other flat implement is inserted in the notch 25, as shown in Figure 8. The clip 12 is forced outwardly with the implement to unlock the cover-ring 8 and the cover-ring is then turned in a counter-clockwise direction until the arcuate notch 19 and the end 22 are adjacent the clips 12 and 13, respectively. The cover-ring may then be lifted from the hook-body.

A thread-removing notch 26 is formed in the inner'periphery of the cover-ring 8. The notch is so inclined that a hook-like knife-edge 2'7 is formed on the inner flange 9 of the cover-ring. The flanges extends down into the channel 11 and the hook-like edge 2'7 provides an efficient means for cutting or removing threads or any other foreign matter that may be caught in the raceway.

From the foregoing description, considered in connection with the accompanying drawing, the construction, manner of operation, and several advantages of my improved loop-taker for sewing machines will be clearly and fully understood. Although I have shown my improved loop-taker in connection with rotary lock-stitch sewing machines, it will be apparent that it has a wide variety of uses and that it may readily be applied to types of lock-stitch sewing machines employing cooperating stitch-forming mechanism other than that hereindisclosed. Therefore the privilege is reserved of resorting to all such legitimate changes therein as may be fairly embodied with the spirit and scope of the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:

1. A sewing machine loop-taker comprising a hook-member formed with a circular raceway, a cover-ring for said raceway, means for accurately positioning said cover-ring on said hookmember and resilient means fixed to said hookmember for urging said cover-ring against said hook-member.

2. A sewing machine loop-taker comprising a hook-member formed with a circular raceway, a cover-ring for said raceway yieldingly held against said hook-member, and means on said cover-ring for preventing lateral shifting movement between said hook-member and said coverring.

3. A sewing machine loop-taker comprising a hook-member formed with a circular raceway, a cover-ring for said raceway, and spring means adapted to yield both outwardly and upwardly with respect to said hook-member for yieldingly urging said cover-ring against said hook-memher.

4. A sewing machine loop-taker comprising a hook-member formed with a circular raceway, a cover-ring for said raceway having a depending centering shoulder adapted to engage said hookmember, and'means for yieldingly urging said cover-ring against said hook-member.

5. A sewing machine loop-taker comprising a cup-shaped hook-member having side walls formed with a loop-seizing beak and a circular raceway, a bobbin-carrier having an annular bearing flange provided with a channel in its upper face, a cover-ring having a downturned innerflange extending into said channel and an intermediate step-like centering shoulder engaging said hook-member, and means for securing said cover-ring to said hook-member.

6. A loop-taker for sewing machines, comprising a cup-shaped hook-member having side walls formed with a loop-seizing beak and a circular raceway formed in its wall, a cover-ring for said raceway having a depending centering shoulder adapted to engage said wall, and spring members fitted in the periphery of said wall and overlying a portion of said cover-ring.

7. Aloop-taker for sewing machines comprising a cup-shaped hook-member having side walls formed with a loop-seizing beak and a circular raceway formed in its wall, a cover-ring for said raceway, resilient means atttached to said hookmember for securing said cover-ring to said hook-member, and means whereby said resilient means is automatically rendered effective when said cover-ring is placed in its operative position for locking said cover-ring.

8. A loop-taker for sewing machines comprising a cup-shaped hook-body having side walls formed with a loop-seizing beak and a circular raceway formed in its wall, a bobbin-carrier having an annular bearing flange fitted in said raceway, a cover-ring for said raceway, yielding members attached to said hook-body and overlying a portion of the upper surface thereof for securing said cover-ring to said hook-body, and means whereby one of said members becomes eifective to lock said cover-ring against turning relative to said hook-body when said cover-ring is in its operative position.

9. In a lock-stitch sewing machine a member formed with a raceway, a bobbin-thread carrier journalled in said raceway, a cover-ring having a locking notch, and spring-biased means on said member adapted to automatically enter said look-- ing notch when said cover-ring is applied to said member.

10. In a lock-stitch sewing machine a member formed with a raceway, a bobbin-thread carrier join'nalled in said raceway, a cover-ring having a centering shoulder, a peripheral locking notch, and a latch-clearance notch spaced circularly of said ring from said locking notch, and a spring-latch secured to said member and having a lip overlying said cover-ring and a shank engaging said locking notch.

11. A sewing machine loop-taker comprising a cup-shaped hook-member having side walls formed with a loop-seizing beak and a circular raceway, a thread-case having a circular bearing flange fiitted in said raceway, a cover-ring forming part of said raceway and overlying the bearing flange on said thread-case, and a plurality of flat L-shaped spring-clips for yieldingly urging said cover-ring against said hook-member, said spring-clips being secured to the base of the having a downturned flange, extending into said channel, said downturned flange being provided with a raceway clearing notch, and L-shaped spring-clips secured to the base and seated in recesses in the periphery of the hook-member for yieldingly urging said cover-ring against said hook-member. i v

' ALFRED GRIEB. 

